Combination pump jack and speed-reducing mechanism



C. HOLMDAHL.

COMBINATION PUMP JACK AND SPEED REDUCING MEGHANISM Filed Feb. s, 1922*V j 17m/@Mor @j myd.

essere per, 2s, asas.

l1; y.aT- ES CHARLES Horiivrnanr., or KELLOGG, IoWA.

COMBINATION PUMP JAoKfANn srnnnmnnucne MECHANISM.

Y ,Applicationinearetiuary s, 1922. serial ita-534,939,

To all whom t mag/concern: Y f 1 new and useful Combination Pump Jack and Speed-Reducing Mechanism, of which .the following is a specification.

The object of my inventionA is to provide a speed reducing mechanism of simple, durable and comparatively inexpensivel construction Which may be either used in connection with a pump jack or forthe purpose of driving belt driven machinery.

A further object is to'provide a speedV reducer having a comparatively few gear devices so arranged that they will have a maximum amount ofstrength with aminmum amount of material in their construction, and so arranged that they may be run constantly in a lubricant and enclosed to proy tect them from dirt and the like.k

A further object is to provide -a `speed reducing gear mechanism` so constructed that a number of teeth of the coacting gears may be constantly in mesh with each other. I A further object is to lprovide a speed vreducing mechanism which maybe easily' and quickly adapted either to be used with belt driven machinery or with a pump jack.

These and other objects will be apparent to those skilled in the art.

Mv invention consists in they construction, arrangement and combination of the various parts of the device, whereby thel 0b- ]'ects contemplated are attained, Vas *herein-V after more fully set forth, pointed out in my claims, and illustrated in the aC- companying drawings, in'which: Figure 1 is an end view of my improved speed reducing device.

Figure 2 is a vertical and longitudina sectional view taken on the line 2-'2 of Figure 1.

Figure 3 is a vertical, transverse, sectional view taken on the line 3 8 of Figure 2. Y

My improved speed reducing devicev is mounted on base members 10 andll.`

The base memberv 10 is provided with a bearing support 12 near one end, anda disc plate`13 at its opposite end, the said disc being mounted perpendicular withthe base 10. Y

`areNT; -ojFFicn i Y. The said disc `13 provided at rits ce1-ify tral portion withY acylindricalv recess 14 concentric with the center Aof the distalv The centralportion ofthe end member -15 ofl saidjrecess isprovided withv arbearing 16 ,having a suitableopening 17 The base member 11 is provided with a disc 18 ofthe same diameter as the disc 13, and provided at its edge witha laterally extending annular flange 19.. This ange 19 is designed to have its freeedgef rest adjacent Eto the edge of the'disc l'sothat a cylindrical space'is provided'between the discs 13 and 18, the said discs being secured l together by means of transversely arranged bolts 20. n f f The central portion :ofthe disc: 18ifi's pro-V vided with a cylindrical hub 21 .to kWhich 4a 'bearing 22 is secured."y The bearing 22 is designed toreceive a shaft 23, which has yone'end extending beyondsaid bearing, andy the opposite end extending througlfr,N the opening`17 of the member'15v and through and beyondthe bearingk member ,12the isaid shaft-being rotatively mounted.

The kouter end of the shaft 23 adjacent to the bearing 12 isprovidedwith a belt wheel 24',y theweb portion ofwhich is kprovidedwith a wrist pin 25 which vis ysolocated that, they said-pin and the ,web vof -the wheel 24 forms a crank to which a pump wheel 24 for the purpose Vof attachingor detaching the pump jacln; f f' i ing detachably secured-intothe web of the f i The opposite endof theshaft 23Y is provided with a similar belt wheel 26 of a larger diameter than the belt wheel 24, the web of which is provided with a wrist in 27 `similar tofthe wrist pin 25 and kso ocated vthat it will have the same throw as the pin 25, so that the two pins may be worked in unison. This provides meansfor attaching the device `tothat type of pump jacks having two connecting rods. Y i

1f `it is desired to use the speed lreducer oaf with a jack having a single-connecting r'od,

said rod may -be connected to either one of the wrist pins.l i l f For driving the Vshaft 23, I khave provided the following mechanism: Rotatively mounted on the vshaft23 within the opening 17 of the member 15, I havey provided a sleevek 28, -theouter end of which is provided with a belt wheel 29, and the inner qend` of which is provided with an eccentric: 30 which is rigidly securedthereto, and designed to operate in the cylindrical portion 14.

Adjacent to the end of the sleeve 28, I have providedahub-member31 keyed to the shaft 23 and rotatively mounted in the Cyvlindrical hub 21.

This hub 31 is provided with adisciwhich is of a considerable less diameter than the disc 18 and mounted ad-L jacent to itsinner face.

The edge of theV disc 32-is p-rovided with a flange 33 carrying a number of gear teeth 34 andvforms what I shall term the external gear. In the device illustrated in the drawings, I have used'thirty teeth in this gear. The inner face of the flange 19 of the disc 18 vis provided with forty teeth 'of the same pitch as' the teeth 34-and forms what I shall term the internalV gear.

L'Thu's it will be seen that an annular space is provided between the teeth of the external and internal gears. R-otatively mounted on the eccentric 30, I have provided a sleeve 35 which is designed to carry a disc 36. This disc 36 is of afdiameter'substantially equal to the difference between the pitch diameters of the internal-and external gears, and provided at fitsedges with a laterally extending annular "aange 37.

The flange y37 has its inner and outer faces provided with a series of teeth of the same pitchas those before mentioned, the outer face carrying thirty-eight teeth while the innerface carries thirty-two teeth.

' By this arrangement, it willv be seeny that theannulanflange 37 is alwayseccentric,

with the internal-and yexternal gears so arranged that a number of theteeth of its inner face will mesh with a number of the externalgean while avnumber of the teeth of its outer face-will mesh with. a number ofthe-teeth of the internal gear, these ltwo points of contact being always diametrically oppositefrom each other, as clearly shown -in Figure 3.

n Winfurther be geen am if the pulley 29- and thev sleeve 2S are rotated, that the Aeccentric 30 will also be rotated which will causef the flange 37 to vbe moved about be tween the flanges 33 and 19 in an eccentric manner so that the teethbefore described Vwill constantly mesh with each other.

It will also be seen that since the outer face ofthe flange 37 has two less teeth than the internal gear, the said flange 37 will be rotated in an opposite direction from that which the eccentric 30 is rotated a distance equal to thc sum? of the pitch of two teeth of the flange 37; or since there is thirty-eight fteeth,the said flange 37 is moved an angle lequal to 1/19th of theY circumference of a i'ci'rcle, yor 1/19th` of one revolution.

inthe opposite direction.

It will be seen that a large numbero'f different; gear rati-os may be obtained with a similar construction merely by changing the ninnber of teeth of the gears and the diameter of the annular member 37 and the disc 32 so that a diflerenceof two teeth is recommended between vthe coacting gear members, as; I find that this number works out better than any other in a gear o'fthis size. It is possible toso design the gears that a. difference of one or threeteeth between thecoacting gears may prevail. With the single tooth. this cuts kdown its depth and 'does not give it as-good a shape as where I provide for a difference of two vor three teeth between the coacting gears.

Thus it will be seen that if the pulley 29 is driven at a predetermined speed, the shaft23-will be driven at a proportionately less speed, the speed reduction h'erewiythl given is substantially correct to use between the ordinary farm engines and pump jacks.

It will further be seen that if the operator wishes to use the device for reduction of speeds between belt driven machinery, he can do so by applying a belt to either of the `pulleys 24 or 26, the pulle `26 being larger in diameter than the pul ey 27 consequently giving a little higher'speed. Or, if the operator desires to obtain a speed higher than that of the engine, he may do so by placing the engine belt on either the pulleys 24 or'26, andthe, pulley 29 will be driven yat a speed higher than that of the pulleys 24. and 26.

Thus it will be seen that I have provided speed reduc-ing device of comparatively simple, durable and inexpensive construction which may be easily and quickly adapted for a number of purposes, and one in which several speed ratios may be obtained by placing thel belts on the proper pulleys.

It will also be seen that the gear devices may. always run in avlubricant which may be placed in the gear chamber througlra plug 38. y It will also be seen that the gears are protected `fromdirt and foreign matter, f and .further that the gea-rs are considerably tively mounted on said eccentric and pro- Y vided with a disk portion perpendicular' I claim asmy invention:

An annular internal gear member designed to orm a support, kthe said annular member being provided with a disk portion at one end, the said disk portion being provided with a central and laterallyV extending hub member,l the inner end of said hub member being recessed, a shaft rotatively mounted in said hub, a gear member Within the said annular member and concentric therewith, said gear member being provided With a hub secured to said shaft and mounted Within the recess of the first said hub, a

sleeve rotatively mounted on said shaft, the

inner end of said sleeve being adjacent to the hub of the second said gear and provided with an eccentric, a bearing member rotathereto, the kollte-redge of said disk being lprovided With an annular internal and'external gear member, the external ygear mem- Y' ber being designed to coact with the krst said'r internal 'gear member .while the inci i ternal gear member ofthe ylast said gear member is designed to coact with the gear of the second said gear member, a disk plate `detachably secured toptheopen end of the first said annular gear member-"to form a closure for all of `said gear vmembers and to rotatively receive the said sleeve, 'and means for driving the outer. end olf said 39' providedat its central portionsv'vith a hub 

